<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>Page Title</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>

</head>

<body>

    <div id="box">
        <input type="checkbox" v-model="toggle" true-value="yes" false-value="no">
        <hr>
        <input type="radio" v-model="picked" value="a">

        <!-- `toggle` 为 true 或 false -->
        <input type="checkbox" v-model="toggle">

        <!-- 当选中第一个选项时，`selected` 为字符串 "abc" -->
        <select v-model="selected">
    <option value="abc">ABC</option>
  </select>

        <hr>
        <select v-model="selected">
    <!-- 内联对象字面量 -->
    <option v-bind:value="{ number: 123 }">123</option>
  </select>

    </div>
</body>
<script>
    var vm = new Vue({
        el: "#box",
        data: {
            selected: ""
        }
    })
</script>

</html>